1 | /* |
1 | /* |
2 | iom.h -- generic I/O multiplexor |
2 | iom.h -- generic I/O multiplexer |
3 | Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2006 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #ifndef IOM_H__ |
22 | #ifndef IOM_H__ |
21 | #define IOM_H__ |
23 | #define IOM_H__ |
22 | |
24 | |
… | |
… | |
24 | // - a vector template like simplevec or stl's vector |
26 | // - a vector template like simplevec or stl's vector |
25 | // - defines for all watcher types required in your app |
27 | // - defines for all watcher types required in your app |
26 | // edit iom_conf.h as appropriate. |
28 | // edit iom_conf.h as appropriate. |
27 | #include "iom_conf.h" |
29 | #include "iom_conf.h" |
28 | |
30 | |
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31 | #if IOM_CHILD |
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32 | # undef IOM_SIG |
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33 | # define IOM_SIG 1 |
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34 | #endif |
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35 | |
29 | #include "callback.h" |
36 | #include "callback.h" |
30 | |
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31 | #ifndef IOM_IO |
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32 | # define IOM_IO 0 |
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33 | #endif |
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34 | #ifndef IOM_TIME |
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35 | # define IOM_TIME 0 |
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36 | #endif |
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37 | #ifndef IOM_CHECK |
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38 | # define IOM_CHECK 0 |
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39 | #endif |
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40 | #ifndef IOM_IDLE |
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41 | # define IOM_IDLE 0 |
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42 | #endif |
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43 | |
37 | |
44 | typedef double tstamp; |
38 | typedef double tstamp; |
45 | extern tstamp NOW; |
39 | extern tstamp NOW; |
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40 | |
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41 | // TSTAMP_MAX must still fit into a positive struct timeval |
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42 | #define TSTAMP_MAX (double)(1UL<<31) |
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43 | |
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44 | //#define IOM_LIBEVENT "event.h" *NOT* a supported feature |
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45 | #ifdef IOM_LIBEVENT |
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46 | # include <sys/time.h> |
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47 | # include IOM_LIBEVENT |
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48 | # undef IOM_IO |
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49 | # define IOM_IO 1 |
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50 | #endif |
46 | |
51 | |
47 | struct watcher; |
52 | struct watcher; |
48 | #if IOM_IO |
53 | #if IOM_IO |
49 | struct io_watcher; |
54 | struct io_watcher; |
50 | #endif |
55 | #endif |
… | |
… | |
55 | struct check_watcher; |
60 | struct check_watcher; |
56 | #endif |
61 | #endif |
57 | #if IOM_IDLE |
62 | #if IOM_IDLE |
58 | struct idle_watcher; |
63 | struct idle_watcher; |
59 | #endif |
64 | #endif |
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65 | #if IOM_SIG |
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66 | struct sig_watcher; |
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67 | #endif |
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68 | #if IOM_CHILD |
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69 | struct child_watcher; |
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70 | #endif |
60 | |
71 | |
61 | template<class watcher> |
72 | template<class watcher> |
62 | struct io_manager_vec : protected vector<watcher *> { |
73 | struct io_manager_vec : vector<watcher *> { |
63 | friend class io_manager; |
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64 | protected: |
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65 | void erase_unordered (unsigned int pos) |
74 | void erase_unordered (unsigned int pos) |
66 | { |
75 | { |
67 | watcher *w = (*this)[size () - 1]; |
76 | watcher *w = (*this)[this->size () - 1]; |
68 | pop_back (); |
77 | this->pop_back (); |
69 | |
78 | |
70 | if (size ()) |
79 | if (!this->empty ()) |
71 | if ((*this)[pos] = w) |
80 | if (((*this)[pos] = w)) // '=' is correct! |
72 | w->active = pos + 1; |
81 | w->active = pos + 1; |
73 | } |
82 | } |
74 | }; |
83 | }; |
75 | |
84 | |
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85 | // only used as a namespace, and for initialisation purposes |
76 | class io_manager { |
86 | class io_manager { |
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87 | template<class watcher> |
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88 | static void reg (watcher &w, io_manager_vec<watcher> &queue); |
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89 | |
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90 | template<class watcher> |
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91 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
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92 | |
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93 | public: |
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94 | #if IOM_TIME |
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95 | // fetch time only |
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96 | static tstamp now (); |
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97 | |
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98 | // set NOW |
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99 | static void set_now (); |
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100 | #endif |
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101 | |
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102 | // register a watcher |
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103 | #ifndef IOM_LIBEVENT |
77 | #if IOM_IO |
104 | #if IOM_IO |
78 | io_manager_vec<io_watcher> iow; |
105 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
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106 | #endif |
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107 | #if IOM_TIME |
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108 | static void reg (time_watcher &w); static void unreg (time_watcher &w); |
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109 | #endif |
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110 | #if IOM_SIG |
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111 | static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
79 | #endif |
112 | #endif |
80 | #if IOM_CHECK |
113 | #if IOM_CHECK |
81 | io_manager_vec<check_watcher> cw; |
114 | static void reg (check_watcher &w); static void unreg (check_watcher &w); |
82 | #endif |
115 | #endif |
83 | #if IOM_TIME |
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84 | io_manager_vec<time_watcher> tw; |
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85 | #endif |
116 | #endif |
86 | #if IOM_IDLE |
117 | #if IOM_IDLE |
87 | io_manager_vec<idle_watcher> iw; |
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88 | #endif |
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89 | |
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90 | template<class watcher> |
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91 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
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92 | |
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93 | template<class watcher> |
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94 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
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95 | |
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96 | public: |
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97 | // register a watcher |
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98 | #if IOM_IO |
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99 | void reg (io_watcher *w); void unreg (io_watcher *w); |
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100 | #endif |
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101 | #if IOM_TIME |
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102 | void reg (time_watcher *w); void unreg (time_watcher *w); |
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103 | #endif |
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104 | #if IOM_CHECK |
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105 | void reg (check_watcher *w); void unreg (check_watcher *w); |
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106 | #endif |
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107 | #if IOM_IDLE |
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108 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
118 | static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
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119 | #endif |
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120 | #if IOM_CHILD |
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121 | static void reg (child_watcher &w); static void unreg (child_watcher &w); |
109 | #endif |
122 | #endif |
110 | |
123 | |
111 | void loop (); |
124 | static void loop (); |
112 | |
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113 | io_manager (); |
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114 | ~io_manager (); |
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115 | }; |
125 | }; |
116 | |
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117 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
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118 | |
126 | |
119 | struct watcher { |
127 | struct watcher { |
120 | int active; /* 0 == inactive, else index into respective vector */ |
128 | int active; /* 0 == inactive, else index into respective vector */ |
121 | |
129 | |
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130 | bool is_active () { return active; } |
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131 | |
122 | watcher() : active(0) { } |
132 | watcher () : active (0) { } |
123 | }; |
133 | }; |
124 | |
134 | |
125 | #if IOM_IO |
135 | #if IOM_IO |
126 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
136 | #ifdef IOM_LIBEVENT |
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137 | enum { EVENT_UNDEF = -1, EVENT_NONE = 0, EVENT_READ = EV_READ, EVENT_WRITE = EV_WRITE }; |
127 | |
138 | |
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139 | void iom_io_c_callback (int fd, short events, void *data); |
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140 | |
128 | struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
141 | struct io_watcher : watcher, callback<void (io_watcher &, short)> { |
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142 | struct event ev; |
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143 | int fd; |
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144 | |
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145 | void set (int fd_, short events_) { fd = fd_; event_set (&ev, fd_, events_, iom_io_c_callback, (void *)this); } |
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146 | |
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147 | void set (short events_) { set (fd, events_); } |
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148 | void start () { event_add (&ev, 0); active = 1; } |
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149 | void start (int fd_, short events_) { set (fd_, events_); start (); } |
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150 | void stop () { if (active) event_del (&ev); active = 0; } |
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151 | |
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152 | template<class O, class M> |
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153 | io_watcher (O object, M method) |
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154 | : callback<void (io_watcher &, short)> (object, method) |
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155 | { } |
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156 | ~io_watcher () { stop (); } |
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157 | }; |
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158 | #else |
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159 | enum { EVENT_UNDEF = -1, EVENT_NONE = 0, EVENT_READ = 1, EVENT_WRITE = 2 }; |
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160 | |
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161 | struct io_watcher : watcher, callback<void (io_watcher &, short)> { |
129 | int fd; |
162 | int fd; |
130 | short events; |
163 | short events; |
131 | |
164 | |
132 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
165 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
133 | |
166 | |
134 | void set (short events_) { set (fd, events_); } |
167 | void set (short events_) { set (fd, events_); } |
135 | void start () { iom.reg (this); } |
168 | void start () { io_manager::reg (*this); } |
136 | void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
169 | void start (int fd_, short events_) { set (fd_, events_); start (); } |
137 | void stop () { iom.unreg (this); } |
170 | void stop () { io_manager::unreg (*this); } |
138 | |
171 | |
139 | template<class O1, class O2> |
172 | template<class O, class M> |
140 | io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) |
173 | io_watcher (O object, M method) |
141 | : callback2<void, io_watcher &, short>(object,method) |
174 | : callback<void (io_watcher &, short)> (object, method) |
142 | { } |
175 | { } |
143 | ~io_watcher () { stop (); } |
176 | ~io_watcher () { stop (); } |
144 | }; |
177 | }; |
145 | #endif |
178 | #endif |
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179 | #endif |
146 | |
180 | |
147 | #if IOM_TIME |
181 | #if IOM_TIME |
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182 | #ifdef IOM_LIBEVENT |
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183 | void iom_time_c_callback (int fd, short events, void *data); |
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184 | |
148 | struct time_watcher : watcher, callback1<void, time_watcher &> { |
185 | struct time_watcher : watcher, callback<void (time_watcher &)> { |
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186 | struct event ev; |
149 | tstamp at; |
187 | tstamp at; |
150 | |
188 | |
151 | void trigger (); |
189 | void trigger (); |
152 | |
190 | |
153 | void set (tstamp when) { at = when; } |
191 | void set (tstamp when) { at = when; } |
154 | void operator ()() { trigger (); } |
192 | void operator () () { trigger (); } |
155 | void start () { iom.reg (this); } |
193 | void start () |
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194 | { |
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195 | struct timeval tv; |
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196 | tv.tv_sec = (long)at; |
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197 | tv.tv_usec = (long)((at - (tstamp)tv.tv_sec) * 1000000.); |
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198 | evtimer_add (&ev, &tv); |
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199 | active = 1; |
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200 | } |
156 | void start (tstamp when) { set (when); iom.reg (this); } |
201 | void start (tstamp when) { set (when); start (); } |
157 | void stop () { iom.unreg (this); } |
202 | void stop () { if (active) evtimer_del (&ev); active = 0; } |
158 | |
203 | |
159 | template<class O1, class O2> |
204 | template<class O, class M> |
160 | time_watcher (O1 *object, void (O2::*method)(time_watcher &)) |
205 | time_watcher (O object, M method) |
161 | : callback1<void, time_watcher &>(object,method) |
206 | : callback<void (time_watcher &)> (object, method), at (0) |
162 | { } |
207 | { |
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208 | evtimer_set (&ev, iom_time_c_callback, (void *)this); |
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209 | } |
163 | ~time_watcher () { stop (); } |
210 | ~time_watcher () { stop (); } |
164 | }; |
211 | }; |
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212 | #else |
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213 | struct time_watcher : watcher, callback<void (time_watcher &)> { |
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214 | tstamp at; |
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215 | |
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216 | void trigger (); |
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217 | |
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218 | void set (tstamp when) { at = when; } |
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219 | void operator () () { trigger (); } |
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220 | void start () { io_manager::reg (*this); } |
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221 | void start (tstamp when) { set (when); start (); } |
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222 | void stop () { io_manager::unreg (*this); } |
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223 | |
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224 | template<class O, class M> |
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225 | time_watcher (O object, M method) |
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226 | : callback<void (time_watcher &)> (object, method), at (0) |
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227 | { } |
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228 | ~time_watcher () { stop (); } |
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229 | }; |
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230 | #endif |
165 | #endif |
231 | #endif |
166 | |
232 | |
167 | #if IOM_CHECK |
233 | #if IOM_CHECK |
168 | // run before checking for new events |
234 | // run before checking for new events |
169 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
235 | struct check_watcher : watcher, callback<void (check_watcher &)> { |
170 | void start () { iom.reg (this); } |
236 | void start () { io_manager::reg (*this); } |
171 | void stop () { iom.unreg (this); } |
237 | void stop () { io_manager::unreg (*this); } |
172 | |
238 | |
173 | template<class O1, class O2> |
239 | template<class O, class M> |
174 | check_watcher (O1 *object, void (O2::*method)(check_watcher &)) |
240 | check_watcher (O object, M method) |
175 | : callback1<void, check_watcher &>(object,method) |
241 | : callback<void (check_watcher &)> (object, method) |
176 | { } |
242 | { } |
177 | ~check_watcher () { stop (); } |
243 | ~check_watcher () { stop (); } |
178 | }; |
244 | }; |
179 | #endif |
245 | #endif |
180 | |
246 | |
181 | #if IOM_IDLE |
247 | #if IOM_IDLE |
182 | // run after checking for any i/o, but before waiting |
248 | // run after checking for any i/o, but before waiting |
183 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
249 | struct idle_watcher : watcher, callback<void (idle_watcher &)> { |
184 | void start () { iom.reg (this); } |
250 | void start () { io_manager::reg (*this); } |
185 | void stop () { iom.unreg (this); } |
251 | void stop () { io_manager::unreg (*this); } |
186 | |
252 | |
187 | template<class O1, class O2> |
253 | template<class O, class M> |
188 | idle_watcher (O1 *object, void (O2::*method)(idle_watcher &)) |
254 | idle_watcher (O object, M method) |
189 | : callback1<void, idle_watcher &>(object,method) |
255 | : callback<void (idle_watcher &)> (object, method) |
190 | { } |
256 | { } |
191 | ~idle_watcher () { stop (); } |
257 | ~idle_watcher () { stop (); } |
192 | }; |
258 | }; |
193 | #endif |
259 | #endif |
194 | |
260 | |
195 | #endif |
261 | #if IOM_SIG |
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262 | struct sig_watcher : watcher, callback<void (sig_watcher &)> { |
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263 | int signum; |
196 | |
264 | |
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265 | void start (int signum); |
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266 | void stop () { io_manager::unreg (*this); } |
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267 | |
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268 | template<class O, class M> |
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269 | sig_watcher (O object, M method) |
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270 | : callback<void(sig_watcher &)> (object, method), signum (0) |
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271 | { } |
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272 | ~sig_watcher () { stop (); } |
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273 | }; |
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274 | #endif |
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275 | |
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276 | #if IOM_CHILD |
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277 | struct child_watcher : watcher, callback<void (child_watcher &, int)> { |
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278 | int /*pid_t*/ pid; |
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279 | |
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280 | void start (int pid) { this->pid = pid; io_manager::reg (*this); } |
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281 | void stop () { io_manager::unreg (*this); } |
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282 | |
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283 | template<class O, class M> |
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284 | child_watcher (O object, M method) |
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285 | : callback<void (child_watcher &, int)> (object, method), pid (0) |
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286 | { } |
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287 | ~child_watcher () { stop (); } |
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288 | }; |
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289 | #endif |
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290 | |
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291 | #endif |
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292 | |